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Periodic explosions by positive feedback in a rising foam column.

C Zener1, J Noriega

  • 1Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213.

Proceedings of the National Academy of Sciences of the United States of America
|May 1, 1982
PubMed
Summary

Aqueous foam columns can periodically explode due to temperature drops. This phenomenon is linked to the foam

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Area of Science:

  • Fluid dynamics
  • Thermodynamics
  • Materials science

Background:

  • Aqueous foams exhibit temperature drops during adiabatic rising.
  • Periodic explosions in foam columns are observed under specific conditions.

Purpose of the Study:

  • To investigate the cause of periodic explosions in adiabatic aqueous foam columns.
  • To elucidate the role of thermal coupling and surfactant concentration in foam instability.

Main Methods:

  • Experimental observation of adiabatic foam columns.
  • Analysis of thermal coupling between foam and enclosing glass.
  • Investigation of surfactant concentration effects on foam thermal conductivity.

Main Results:

  • Foam temperature drops during adiabatic ascent.
  • Explosions are traced to thermal coupling between foam and glass.
  • A positive feedback loop involving heat flow and thermal conductivity was identified in unbuffered foams.
  • The heat-pipe effect in foam cells is influenced by surfactant density.

Conclusions:

  • Periodic foam explosions are driven by a positive feedback mechanism.
  • This mechanism involves thermal coupling, surfactant concentration, and the heat-pipe effect.
  • The absence of micellar buffering is crucial for this instability.

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